Shijou Saikyou no Deshi Kenichi Ken'ichi, el discípulo más fuerte de la historia

También conocida como: 史上最強の弟子ケンイチ · History's Strongest Disciple Kenichi · Kenichi: The Mightiest Disciple · Histories Strongest Disciple Kenichi · HSD Kenichi · Ken'ichi, el discípulo más fuerte de la historia · Kenichi, il discepolo più forte della storia · Kenichi: O Discípulo Mais Forte da História (Portuguese) · Kenichi: Pelajar Terkuat dalam Sejarah (Malay) · Le disciple le plus fort de l'histoire · Najjači borac Keniči (Serbian) · Shijo Saikyo no Deshi Kenichi · Shijō Saikyō no Deshi Ken'ichi · Strongest Disciple Kenichi · Sử thượng tối cường chi đệ tử Kiêm Nhất

The story is focused on Kenichi Shirahama, an average 15-year-old weakling, whose life turns to Hell with the appearance of the naive, beautiful, and strong transfer student, Miu Fūrinji. After Kenichi witnesses Miu's skills in martial arts, he joins the Ryōzanpaku dojo, the gathering place of those who are truly strong, which also happens to be Miu's home. After beating a karate student in a match, he is soon targeted by all the delinquents in the school. Since then, Kenichi's routine is divided between his hellish training with the masters of Ryōzanpaku, and his fights against the members of Ragnarok, a gang who views him as either a possible ally or an impending threat to their plans.